Standalone MMC Hardware Manual
27
Danaher Motion
version 15.1
Installation, Operation, & Maintenance
Figure 3-6: Connecting Shielded Cable
The two different methods of terminating shields are used to accommodate two
different immunity requirements. Immunity required inside an enclosure is considered
lower because cables are typically less than three meters in length and/or can be
separated from each other and from noise sources.
Immunity required external to an enclosure is considered higher because the user
may have less control over the noise environment. Low level signal cables that can be
external to an enclosure are tested at a 2 KV level for electrical fast transients (EFTs).
Low level signals that can be less than three meters in length or can be separated
from noise sources are tested at a 1 KV level. Under the stated conditions, there will
be no disturbance of digital I/O, encoder, or encoder operation. For analog signals,
there may be momentary disturbances but there will be self-recovery when the noise
subsides.
Do not operate transmitters, arc welding equipment, or other high noise radiators
within one meter of an enclosure that has the door open. Continue to equip inductive
devices, if they are in series with a mechanical contact or switch, with arc suppression
circuits. These devices include contactors, solenoids and motors. Shield all cables
that carry heavy current near the system, using continuous foil wrap or conduit
grounded at both ends. Such cables include power leads for high-frequency welders
and for pulse-width-modulated motor drives.
3.5.2
Differential Devices for Analog and Encoder Signals
A
differential
device receives or sends one signal over two wires (typically a shielded
twisted pair). The input/output voltage at the second terminal is the inverse of the first.
Information is received/sent as the difference between the two voltages.
WARNING
Use care when wiring I/O devices to the MMC and when plugging in cables.
Wiring the wrong device to the connector or plugging a connector into the
wrong location could cause intermittent or incorrect machine operation.
External
Drive
MMC
Cabinet
Enclosure
Summary of Contents for Standalone MMC
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